There are many tatpuruṣas (one for each noun case, and a few others besides); in a tatpuruṣa, one component is related to another. For example, "boathouse" is a dative compound, a house for a boat. It would be called a caturthī-tatpuruṣa (caturthī refers to the fourth case — that is, the dative). The most frequent kind is the genitive tatpuruṣa. Examples are:-